| 摘要 |
At least the outer and inner rings of a rolling bearing are made of a steel whose microstructure consists essentially of a mixture of ferrite and cementite. The microstructure is produced by quenching or carbonitriding the steel and tempering it at a temperature higher than a third stage tempering temperature for steels (eg >300{C). The process makes it possible to prevent the formation of indentations which can result from prolonged exposure to high-temperature conditions, dropping or other impact loads. The steel may be high-carbon chromium bearing steel. After the process, the surface hardness may he increased to HRC 56 or above by shot peening or rolling.
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